The other place that I added insulation (besides the dog house and in the engine compartment) was under the passenger desk. When I replaced my chassis battery and had to cut the board under the passenger desk, I put insulation underneath the piece of wood that I cut for access and filled the area underneath the wood with insulation. My passenger says it makes a big difference in noise level. It’s also a lot easier to get to that side of the engine from above.
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